<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <!-- <style>
      div {
        height: 100vh;
        background: rgba(0, 0, 0, 0.7);
        color: #fff;
        line-height: 100vh;
        text-align: center;
        font-size: 20vh;
      }
      .a-img1 {
        background-image: url(https://images.pexels.com/photos/1097491/pexels-photo-1097491.jpeg);
        background-attachment: fixed;
        background-size: cover;
        background-position: center center;
      }
      .a-img2 {
        background-image: url(https://images.pexels.com/photos/2437299/pexels-photo-2437299.jpeg);
        background-attachment: fixed;
        background-size: cover;
        background-position: center center;
      }
      .a-img3 {
        background-image: url(https://images.pexels.com/photos/1005417/pexels-photo-1005417.jpeg);
        background-attachment: fixed;
        background-size: cover;
        background-position: center center;
      }
    </style>
    <div class="a-text">1</div>
    <div class="a-img1">2</div>
    <div class="a-text">3</div>
    <div class="a-img2">4</div>
    <div class="a-text">5</div>
    <div class="a-img3">6</div>
    <div class="a-text">7</div> -->
    <style>
      html {
        overflow: hidden;
        height: 100%;
      }
      body {
        /* 3D */
        perspective: 1px;
        transform-style: preserve-3d;
        height: 100%;
        overflow-y: scroll;
        overflow-x: hidden;
      }
      #app {
        width: 100vw;
        height: 200vh;
        background: skyblue;
        padding-top: 100px;
      }
      .one {
        width: 500px;
        height: 200px;
        background: #409eff;
        transform: translateZ(0px);
        margin-bottom: 50px;
      }
      .two {
        width: 500px;
        height: 200px;
        background: #67c23a;
        transform: translateZ(-1px);
        margin-bottom: 150px;
      }
      .three {
        width: 500px;
        height: 200px;
        background: #e6a23c;
        transform: translateZ(-2px);
        margin-bottom: 150px;
      }
    </style>
    <div id="app">
      <div class="one">one</div>
      <div class="two">two</div>
      <div class="three">three</div>
    </div>
  </body>
</html>
